package Ch02.ShangJi;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.File;

public class Shangji2 {
    public static void main(String[] args) throws Exception {
        //得到DOM解析器的工厂实例
        DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
        //从DOM工厂获得DOM解析器
        DocumentBuilder db = dbf.newDocumentBuilder();
        //解析XML文档，得到一个Document对象，即DOM树
        Document doc=db.parse("src/Ch02/ShangJi/Phone.xml");
        //删除节点
        NodeList list= doc.getElementsByTagName("Brand");
        for (int i = 0; i < list.getLength(); i++) {
            Element brandElement=(Element) list.item(i);
            String brandName=brandElement.getAttribute("name");
            if (brandName.equals("小米")){
                brandElement.getParentNode().removeChild(brandElement);
            }
        }
        //保存xml文件
        TransformerFactory transformerFactory=TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        DOMSource domSource=new DOMSource(doc);
        //设置编码
        transformer.setOutputProperty(OutputKeys.ENCODING,"utf-8");
        StreamResult result = new StreamResult(new File("src/Ch02/ShangJi/Phone.xml"));
        transformer.transform(domSource,result);


        /**
         * 第二章上机2 修改属性
        //修改节点信息
        NodeList list = doc.getElementsByTagName("Brand");
        for (int i = 0; i < list.getLength(); i++) {
            Element brandElement=(Element) list.item(i);
            String brandName=brandElement.getAttribute("name");
            if (brandName.equals("三星")){
                brandElement.setAttribute("name","小米");
            }
        }
        //保存xml文件
        TransformerFactory transformerFactory=TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        DOMSource domSource=new DOMSource(doc);
        //设置编码
        transformer.setOutputProperty(OutputKeys.ENCODING,"utf-8");
        StreamResult result = new StreamResult(new File("src/Ch02/ShangJi/Phone.xml"));
        transformer.transform(domSource,result);
         */


        /**
         *  第二章上机2
        //创建Brand节点
        Element brandElement = doc.createElement("Brand");
        brandElement.setAttribute("name","三星");
        //创建type节点
        Element typeElement = doc.createElement("Type");
        typeElement.setAttribute("name","NoteX");
        //添加父子关系
        brandElement.appendChild(typeElement);
        Element phoneElement = (Element)doc.getElementsByTagName("PhoneInfo").item(0);
        phoneElement.appendChild(brandElement);
        //保存xml文件
        TransformerFactory transformerFactory=TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        DOMSource domSource=new DOMSource(doc);
        //设置编码
        transformer.setOutputProperty(OutputKeys.ENCODING,"utf-8");
        StreamResult result = new StreamResult(new File("src/Ch02/ShangJi/Phone.xml"));
        transformer.transform(domSource,result);
*/
    }
}
